ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,420,461, issued on Sept. 23.
"Method of manufacturing a customized mattress" was invented by Shenghao Liu (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "The method of manufacturing a hybrid mattress discloses a novel molding process to embed springs into foam, comprising the following steps: (1) creating a mold board with a number of pegs positioned in a specific configuration; (2) placing springs around the pegs positioned on the mold board; (3) placing the mold board on a pouring table with the pegs and springs facing upward; (4) pouring liquid foam around the pegs onto the mold board; (5) waiting for the liquid foam to mature; and (6) remov...